ELECTROCHROISM STUDIES OF 3 $p \leftarrow n$ RYDBERG TRANSITION OF ACETONE
Loading...
Date
1975
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
The effects of intense electric fields (ca. $2 \times 10^{5}$ volt $cm^{-1}$) on the absorption spectra of molecules in the gas phase have been investigated for the purpose of determining excited-state electronic symmetries, permanent dipole moments, and mean polarizabilities. The theory utilized to interpret the experimental data with respect to these excited-state properties will be discussed for molecules possessing $C_{2{v}}$ symmetry. The experimental apparatus also will be described. Electric-field data will be presented for the acetone 1954 \AA band, which has been assigned to the $3 s \leftarrow n$ Rydberg transition, where $n$ denotes the nonbonding $2p$ (perpendicular to the symmetry axis) orbital on the oxygen atom. The interpretation of the data supports this assignment from the standpoint of the excited-state electronic symmetry (i.e.$b_{2}$ representation). The changes from the ground-state values of the dipole moment and mean polarizability, upon excitation, will be discussed with respect to the philosophy of molecular Rydberg transitions involving non-bonding electrons. The dipole moment was found to be reduced by $0.48 \pm 0.02$ D and the polarizability was found to be increased by $17.3 \pm 1.5 \times 10^{-24}$ cm$^{3}$.
Description
This work was supported by The Robert A, Welch Foundation.""
Author Institution: Department of Chemistry, North Texas State University
Author Institution: Department of Chemistry, North Texas State University